Description: Replacing a Cloudy Aquarium Tank Trouble... A dirty aquarium is bad for your pet fish's life. Keep your water pet habitat hygienic with this Eco-Aquarium Water Filter Cube. A fish tank cleaner that filters out dirt, cloudiness and odors... Honeycomb Ultra-Absorptive Activated Carbon Cube How to Use Wash cubes with warm water and soap before use. It is recommended to be placed near the water inlet of the fish tank water pump. Do not place the grille filter downward, otherwise it will be clogged and affect the filtering effect. For best results, rinse or replace filter every 3 to 6 months. Features: The aquarium filter water cube is made of activated carbon with a dense mesh structure. It absorbs 99% of harmful bacteria in the aquarium, as well as odors. It can effectively reduce the nitrate bacteria in the aquarium and adjust the pH value. It also absorbs organic waste from the aquarium. aisle